Frank, I did not base my comments on that one web article, if you will
reread my comments. H pipes have been around for a long time and have
proven benefits. The article Theo sent was a same same comparison of H
vs X, on the same car, and as I said, I was surprised at the H having a
better performance.
I also said that exhaust systems are part science and part art. They
also depend on a particular set up, and will develop more or less
depending on the particulars of that car.
I also said I looked at the X pipe, but neither I or my muffler guy
could figure out how to put it in a Tiger, without a lot of work and
$$$$$$. The benefits of a crossover pipe, either the H or X is real,
but less than 10% at best, so for the cost/benifit ratio, I went for the
H pipe.
It worked for me in my engine combo.
I also made a cold air box for my car, with a second hood with a reverse
air scoop. It also works.
Larry
Frank Marrone wrote:
>>Frank, I looked at the X pipe, but I could see no way to put it in. Of
>>course you could shorten the collectors , but that hurts the torque
>>curve. And Theo's suggestion of angling the collectors would help get
>>it in, Maybe. But why do this if the torque and HP are the same or
>>better with the H pipe.
>>
>>
>
>Larry, I don't think you can draw any conclusion that an H pipe is better
>than an X pipe based on that one web article, you know better than that and
>you pretty much sum it up when you talk about the eBay HP claims.
>
>There is a large body of experience out there that favors the X pipe in most
>applications. The siamesed cross-over is supposed to be even better as a
>refinement of the typical X design. In addition I think Michael said it
>well when he stated that "a WELL DESIGNED "X" pipe is better than an "H"
>pipe", I believe this is always key, whatever configuration it must be well
>designed.
>
>I totally agree that there seems little chance that the X topologies will
>work on a Tiger, I simply am interested to know if Dr. Gas had any input on
>this during the SUNI presentation. I've already pretty much committed
>myself to an H-pipe (despite the claims on some web pages that they can
>actually hurt performance Vs. no cross-over at all).
>
>Also, I also totally agree that the dyno must be the final judge for all
>modifications. The only real way to tell is to try different combinations
>on the target vehicle and compare them on the dyno. You really can not
>expect to draw any conclusions on performance numbers made on widely
>different vehicles. You can't deduce how a particular exhaust configuration
>will work on a carbureted Tigers by looking at data for late model FI
>Mustangs with cats.
>
>For me it's not about who currently has the best set up on their Tiger or
>what makes the most sense as far as cost or practicality. It is about
>learning about interesting new ideas and, hopefully, testing some of the new
>ideas in real life.
>
>Frank
>B9471116
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